Thursday
April 24, 2014

Posts by Don


Total # Posts: 396

math
oout of 45 people ,37 caught the train,15 the bus,5 walked.how many caught both bus and train?

math
28 students,all of whom study either science,language or both.18 students study language and 14 study science.how many students study acience and language? and how many study only science?

math
there are 28 students,all of whom study either science,language or both,18 students study language and 14 study science.How many students study science and language?

math
6 builders worked 8 hours a day for 10 days to complete a job.If 8 builders worked 6 hours a day for 3 days,the remaining work has to be completed by 6 builders in 8 days.How many hours does each builder need to work each day?

math
6 builders worked 8 hours a day for 10 days to complete a job.If 8 builders worked 6 hours a day for 3 days,the remaining work has to be completed by 6 builders in 8 days.How many hours does each builder need to work each day?

math
how many grams are there in 1 km

math
3trucks are equal in weight to 2 trucks and 2 sedans.What fraction of the weight of a truck is the weight of a sedan

math
front wheels of a cart have a circumference of 3 metres.back wheels have a circumference of 4 metres.A white dot is painted on the rim of each wheel it touches the ground.the cart is then driven 100 metres.including the starting position,how many times will the white dots be o...

math
121 balls are placed in group of 7and 5 in basket.how many baskets 0f 7 were there?

math
how many words of 1;2;3 letters can be made from the letters in CART

math
the day is 1hour 18minutes longer than the night.how long is the day?

math
how to write 9.035 in expanded notation

math
complete these series,1,8,27,64,___,____

math
complete these series,1,8,27,64,___,____

math
twin primes have one composite number between them(e.g.5,7).write one pair of twin primes between number 20 and 40

math
label its dimensions after you rule a square the same area as this rectangle on the back of this sheet 16mm ,4mm

math
1/5 of 35 +16 equal?

math
how many times greater is the first 7 than second in 876574?

math
there are 3 shirts,2 caps,4 pairs of shorts.how many different outfits can wear ?(consisiting of one shirt,one pair of shorts and one cap

math
howmany degrees does a person turn who was facing north and now faces south?

math
there are 23 of? in 2.3

math
what is different between a decimal and a decimal point?

math
.in the decimal fractions0.1 and 0.02 the numeral 1 is ?

math
what fraction of 6cm is 15mm .

math
express64in3 different ways,using only index notation

Physics
An electric immersion heater is rated 5 A when connected to a 120V circuit. What is the resistance of the heater? If it takes 168 KJ to heat 500 ml of water from 20 deg C to boiling, how long does it take to heat the water?

Physics
Ahhh so its 120*7.5*50seconds 7.5 being the amps that the drill draws and 50 being the time and 120 being the voltage.

Physics
Hi bob, could you explain how you came to that calculation, please. As in where did the 1.5 come from, and the 50 joules(it was 50 seconds) I'm lost, could you help? Thanks

Physics
An electric drill operates at a potential difference of 120V and draws a current of 1.5 Amps. If it takes 50 seconds to drill a hole in a piece of steel,calculate the amount of electrical energy used by the drill in that time.

Computer
I have open office and can't find the symbols tab.. arghh

Computer
Hi Ms. Sue ... how do you make the small 3 by itself after the 10?

Computer
On a laptop, how do you get the 10 to the 3rd power? ( make a small 3 after the 10?)

physics
a 12 Volt car battery supplies 1.0 x 10^3 C of charge to the starter. How much energy is used to start the car? ( it's not 10 cubed, but 10 to the third power)

physics 30
an object is thrown from 1.5m above the ground with a velocity of 15m/s and at an angle of 25deg with the ground. using vectors and motion equations, determine how long the object will remain in the air before returning to the ground. ARGHHHHHH help please..

Physics
a 70g bag of potato chips contains 1.6MJ of energy. Working at your maximum power, how long would it take to burn this energy?

Physics
If I know the length of all 3 sides in a right angle triangle, how do I get the degrees of the other angles? Which formula do I use again?

Physics 30
a 2000kg car traveling east at 24m/sec enters an icy (frictionless) intersection and collides with a 3600kg truck traveling south at 10 m/sec. If they become coupled together in the collision, what is their velocity immediately after impact?

math
there are 3 arrays for 4, how many arrays can be drawn for each prime numbers

math
there are 122 houses,how many times does the digit 2 appear on the letterboxes?

maath
there are 3 arrays for 4.how many arrays can be drawn for each prime numbers

Physics 30
If a truck moving at 30km/hr accelerates at 2.5m/s^2 to 50 km/hr, what time (in sec) does it take? a. 2.22s b. 5.56s c. 8 s d. 28.8s

algebra
if the red river is 500 miles longer than the blue river. if the sum of their lengths is 5550 miles what is the length of each river

algebra
Can someone help me figure this out please? when you solve a system of equations by the substitution method, how do you determine whether the system of equations is inconsistent? thank you anyone

algebra
I need help. Can someone help me please. Explain how you can determine from the graph of a system of two linear equations in two variables whether it is an inconsistent system of equations. Thank you

Physics
(.50 kg )(35.7m/s^2) = ? kilograms meters per second squared

calc
by applying rolle's theorem, check whether it is possible that the function f(x) = x^5 + x -17 has two real roots. your reason is that if f(x) has two real roots then by rolle's theorem, f'(x) must be equal to what at certain value of x between these two roots, but...

chemistry
Carbon monoxide gas and hydrogen gas are mixed in a two liter flask. The reaction produces methanol gas as the only product. At equilibrium the Keq is 1.1 x 10-5. The flask initially held 6 grams of hydrogen and the equilibrium concentration of hydrogen is 0.1 M. How many gram...

Discete Math
Show that there must be at least 90 ways to choose six integers from 1 to 15 so that all choices have the same sum.

Physics 30
First A(B-A) then subtract B again from that answer. I see A as (0,3.5) and B as (-4.2,0) I hope thats the right way algebraically.

Physics 30
Hi Bob ... the first post is actually the question .. subtract B from A(B-A)

Physics 30
Vectors A) 3.5 cm North B) 4.2 cm West Algebraically subtract B from A(B-A) Whaaaa? Please help

math
a sales representative earned four times as much in the fourth week of jan than any other week in jan what is the income for the fourth week

math
If a tree is 10 feet tall after two years and 25 feet tall after 5 years, find the rate of change of growth of the tree if y is the height in feet and x is the number of years. Be sure to give correct units.

chemistry
(100g)(.473J/g°C)(x-62°C) =-(500g)(4.184J/g°C)(x-22°C) Q = mass•specific heat•change in temperature Can someone show me how to solve this so i can teach myself before my test on Monday ..thanks for your time

Math
Fred runs a lap every 2 minutes and Mark runs a lap every 2.5 minutes. They start together. How long will it be before they are next to each other again?

Trig
(x+3)^2/4^2 + (y-2)^2/5^2 The location of the Foci are at: a.(-3,-1) and (-3,-5) b. (-3,2) and (-3,5) c. (-3,-3) and (-3,7) d. (-3,1) and (-3,-5) I get (-3,2) and (-3,5) Am I correct?

Trig
The question is: Set up a 2 column proof to show that each of the equations is an identity. Transform the left side to become the right side. a. (tan + cot)^2 = sec^2 + csc^2 I'm having trouble with this. b. (cos + sin)/cos + (cos - sin)/sin = csc sec I'm having troubl...

Trig
Thanks Damon.

Trig
The actual question goes : make the left the same as the right: left side: tan/sec - 1 = right side sin/1-cos

Trig
(sin/cos)/ ( 1/cos - 1) = I'm stumped

Trig
The question says: Set up a 2 column proof to show that each of the following equations is an identity. Transform the left side to become the right side. (tan + cot)^2 = sec^2 + csc^2

Trig
Hi Damon .. apparently they want the right side to stay "as is" and for the left side to transform into exactly what the right side says .... sorry

Trig
Proving Identities: 2 columns (tan + cot)^2 = sec^2 + csc^2 I'm having trouble breaking down the left side to = the right side.. Any help please

Trig
ARGHHHHH now that really was a brain fart on my part ... Thanks a lot Reiny for the help Don

Trig
(x+0)^2 + (y+4)^2 = 17 the center would be (0,4) I can't see it any other way ...arghhhh

Trig
I'm not sure what your looking for Reiny. It looks like the center of the circle is still (0,4) what am I doing wrong?

Trig
the center of a circle x^2 + y^2 + 8y =1 is a. (0,-2) b. (0,4) c. (0,1) d. (0,-4) I believe the answer is (0,4) Am I correct ?

Trig
The center of the circle (x+2)^2 + (y-3)^2 =1 is a. (2,3) b. (-2,3) c. (2,-3) d. (-2,-3) I believe b. is the answer, is that correct?

Trig
The radius of: (x+2)^2 + (y-3)^2 =9 is 3 is this correct?

Trig
If the center of a circle is at (2,2) with a radius of 4 the equation of the graph would be : a) (x-2)^2 + (y-2)^2 = 16 b) (x+2)^2 + (y+2)^2 = 16 I think it would be b is that correct?

Trig
Oops, brain fart ... answer is -4/5 i guess it was a long day ... thanks anyway .. Don

Trig
Half Angle Identities cosx = 7/25 greater than 270 deg and less than 360 Determine cos 1/2x a. -7rt2/10 b. 7rt2/5 c.7/25 d.-4/5 I get 7rt2/5 Is this correct??

Trig
Half angle identities Find exact values of a) cos 1/2 b) sin 1/2 c) tan 1/2 based on: cos = 1/5 greater than 270 deg less than 360 deg. I get a) - rt 3/5 b) rt24/5 and c) does not work out at all .... Help please.. book says for answers a)-rt15/5 b) rt10/5 c) -rt6/3 How do you...

Trig
Found my mistake .... All is good now Thanks for the help earlier Damon Don

Trig
If sinx = 1/4 Find the exact value of cos2x I used the formula for double angle identities : cos2x = 1-2sin^2x and got the answer 1/2 The book says the answer is 7/8 How would they get to that conclusion?

Trig
The answer is 1/8 Is that correct Damon ?

Trig
If tanx = 2/3 tany = 1/2 then tan(x-y) = ?? a.7/4 b.7/6 c.1/8 d.8/6 which answer is correct ??

Trig
= sin (a+b) = sin 70 Is that right Damon ?

Trig
sin45cos25 + cos45sin25 = ?? a. cos70 b. sin70 c. cos20 d. sin 20 which answer is correct ??

Trig
cos45cos25 - sin 45sin25 = ?? a. cos70 b. sin70 c. cos 20 d. sin 20 which answer is correct ?

Trig
Use reduction identities to determine if the following statement is true or false: tan (A-B) = tan (B-A) Is this starement True or False ?

Trig
Rewrite tan 88 deg in terms of its cofunction How does that end up????

Trig
cot (tan + cot) = ?

Trig
( sec -1 )(sec +1 ) = ?

Trig
sin/tan = ?

Trig - Thanks Damon and Lindsey
Thanks a bunch

Trig
If sin = 2/3 and is a second quadrant angle, determine the exact value of sec^2 could be a. 5/9 b. root5/3 c. 9/4 d. 9/5 Please help.......

Trig
The next two steps in solving this trig identity question are ??? 1/csctheta x costheta x sintheta x sectheta = sinsqtheta arghhh need help please

Trig
Prove the equation is an identity : csc3theta - csctheta + cottheta/csctheta = cotsqtheta + costheta wow ... try that one

Trig
Prove that the equation is an identity: cot4theta - csc4theta = -cot sq theta - csc sq theta How ??

Trig - Thanks Damon
Thanks for the help Damon. Much appreciated. Don

Trig
Column 1 Column 2 (sin theta + cos theta)sq 1 + 2sin theta cos theta Question : how do you get column 1 to be the same as column 2?? using the trig identities

Trig
Column 1 Column 2 sec theta - cos theta tan theta sin theta Question: how do you get column 1 to be the same as column 2 ?? using the eight fundamental identities

Math C30
Eight Fundamental Identities Sec thada - Cos thada- on one side tan thada sin thada- on the other side How do you do this ???

Trig
Please disregard last question .... wrote it down wrong .. Thanks

Trig
Eight Fundamental Identities Sec thada - Cos thada How do I do this?

Math C30
The first step in solving the equation: 4 sinx - sinx = 0 is what?

Physics
If a force of 20N stretches a spring 15 cm, by what amount will the spring stretch is if a force of 80 N is applied?

Math C30
What's next? Solve: cosx(tanx + sqroot3) - sqroot3/2(tanx-sqroot3) Provide exact answers .. help

Math C30
In steps how do you go from: y = 25cos pi/200x + 30 to get the answer 44.695

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